package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 搜索Service 实现类
 *
 * @author xiaoping
 * @create 2020/6/24 17:15
 * @since 1.0.0
 */
@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;

    /**
     * 检索所有的参数，es检索
     *
     * @param param
     * @return
     */
    @Override
    public SearchResult search(SearchParam param) {
        //1.动态构建出查询需要的DSL语句
        SearchResult result = null;
        //1，准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(param);
        try {
            //2，执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3，分析响应数据封装我们需要的格式
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 查询：模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 bool - filter - 按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2 bool - filter - 按照三级品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2 bool - filter - 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size()>0){
            //attrs=1_5寸:8寸$attrs=2_16G:8G
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                //检索属性id
                String attrId = s[0];
                //检索属性值
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //1.2 bool - filter - 按照库存是否进行查询
        if (param.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock()==1));
        }

        //1.2 bool - filter - 按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length ==2 ){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length ==1 ){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //封装所有条件
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        //2.2 分页 pageSize:5
        /*
           pageNum:1 from:0 size:5 [0,1,2,3,4]
           pageNum:2 from:5 size:5
           from = (pageNum-1)*size
         */
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3 高亮,必须跟模糊查询一起
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */
        //1，品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        /* 聚合 brand */
        sourceBuilder.aggregation(brand_agg);
        //2,分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        /* 聚合 catalog */
        sourceBuilder.aggregation(catalog_agg);
        //3,属性聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_age = AggregationBuilders.terms("attr_id_age").field("attrs.attrId");
        //聚合分析出当前attr_id对应的名字
        attr_id_age.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的名字
        attr_id_age.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_age);
        /* 聚合 attr */
        sourceBuilder.aggregation(attr_agg);
        String s = sourceBuilder.toString();
        System.out.println("构建的DSL：" + s);


        return new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        //1，返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    esModel.setSkuTitle(skuTitle.getFragments()[0].string());
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //2，当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_age = attr_agg.getAggregations().get("attr_id_age");
        for (Terms.Bucket bucket : attr_id_age.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //属性id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //属性名称
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(MultiBucketsAggregation.Bucket::getKeyAsString).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
            result.getAttrIds().add(attrId);
        }
        result.setAttrs(attrVos);
        //3，当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.品牌id
            brandVo.setBrandId(Long.valueOf(bucket.getKeyAsString()));
            //2.品牌名称
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3.品牌图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4，当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            catalogVo.setCatalogId(Long.valueOf(bucket.getKeyAsString()));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //============以上从聚合信息中获取==================
        //5,分页信息-页码
        result.setPageNum(param.getPageNum());
        //6，分页信息-总记录数

        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7，分页信息-总页码-计算  11/2= 5 .. 1
        int totalPages = (int) (total%EsConstant.PRODUCT_PAGESIZE == 0 ? total/EsConstant.PRODUCT_PAGESIZE : (total/EsConstant.PRODUCT_PAGESIZE+1));
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 0; i < totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //8，构建面包屑导航功能
        List<SearchResult.NavVo> collect =null;
        if (!StringUtils.isEmpty(param.getAttrs()) && param.getAttrs().size() > 0){
            collect = param.getAttrs().stream().map(attr -> {
                //分析每个attrs传递过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        //品牌，分类面包屑导航
        if(param.getBrandId()!=null && param.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = new ArrayList<>();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            /* 远程查询所有品牌 */
            R r = productFeignService.brandInfo(param.getBrandId());
            if (r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName()).append(";");
                    replace = replaceQueryString(param, brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                navs.add(navVo);
            }
            result.setNavs(navs);
        }

        //分类: 不需要导航取消




        return result;
    }

    private String replaceQueryString(SearchParam param, String value,String key) {
        //取消这个面包屑以后，我们要跳转到那个地方,将请求地址的url里面的当前值置空
        //拿到所有查询条件，去掉当前
        //中文编码替换
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //浏览器对空格编码和java不一样,差异化处理
            encode = encode.replace("+", "%20");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }


}
